The US senate has voted to approve a bill requiring withdrawal of American troops from Iraq within 11 months.
The senate vote comes after the House of Representatives narrowly approved the bill making further funding of the Iraq war conditional on a timetable for the withdrawal of all US combat troops by March 31st next year.
President George Bush has said he will veto the Democrat-sponsored bill immediately.
The Democratic-led House narrowly approved the bill 218-208, ignoring President Bush's promise to veto any bill that sets deadlines for withdrawing US troops from Iraq.
Some $100 billion of the $124 billion bill will be used to pay for the wars in Iraq and Afghanistan this year, in addition to the $70 billion already appropriated by Congress for war this year.
However, Democrats want to use the rest of the $124 billion for domestic programmes, ranging from more health care for poor children and veterans to helping farmers recoup weather-related losses.
The Democrats' bill would allow some US troops to stay in Iraq beyond March to continue training Iraqi soldiers, protect US facilities and to conduct anti-terrorism missions.
There are about 146,000 troops in Iraq now, with 30,000 more on the way as part of Mr Bush's troop buildup.
The Senate is expected to approve the legislation today, sending it to Mr Bush for what would be only his second veto in more than six years as president.
"Tonight, the House of Representatives voted for failure in Iraq and the president will veto its bill," a White House spokeswoman said.
Pennsylvania Democrat John Murtha who has led efforts to end the war, said it was "ironic" that Mr Bush will be sent the bill on Tuesday, the fourth anniversary of the president's speech aboard a US aircraft carrier carrying a banner claiming "mission accomplished" in Iraq.
The House vote came hours after the US commander in Iraq came to Capitol Hill to brief lawmakers on the status of the war, a briefing the White House had hoped would bolster support.
Republicans are claiming that any timetables for withdrawal would handcuff US military leaders and encourage enemies in Iraq.